refactor!: Rename action to publish-image-index-manifest

[Techassi]

The official terms are:

• Image Index (Manifest): An OCI image index manifest which points to one or more image manifests.
• Image Manifest: An OCI image manifest per platform

See the spec.

flowchart TB
    ii["
        sdp/kafka:1.2.3-stackable25.7.0 
        (Image Index Manifest)"]
    im-1["
        sdp/kafka:1.2.3-stackable25.7.0-amd64
        (Image Manifest)"]
    im-2["
        sdp/kafka:1.2.3-stackable25.7.0-arm64
        (Image Manifest)"]

    ii -- contains --> im-1
    ii -- contains --> im-2

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[NickLarsenNZ]

It was with intent that I suffixed those with "manifest", because they are, by the specs definition of manifest.

But, if you need it to match the spec, I guess go for it, but it makes me uncomfortable and I think it is an unnecessary change.

[Techassi]

Man, I hate everything about this. The spec is a joke.

I will revert the rename (and opt for a better action name: publish-image-index-manifest), but will keep the new output.

[NickLarsenNZ]

LGTM